7 Timeline of countries that changed over to the SI units of measurement.Identify the three countries that have not changed to this system.USA, Liberia, & Burma
8 Measurement Describe the world using numbers Types of Measurement include:Distance, time, speed, volume, mass…Measurement can also help describe events
9 Metric System Called the International System of Units or SI Decimal system based on 10’sPrefixes include:Milli (1/1000th)Deci (1/10th)Kilo (1000)
10 Metric SystemUsed by scientists all over the world to measure length, volume, mass, weight, density, and temperature.King Hector Doesn’t Usually Drink Chocolate MilkKILOHECTODEKAUNITDECICENTIMILLI
11 Precision and Accuracy Precision is the closeness of repeated measurements to each other.Accuracy is the closeness of a measured or derived data value to its true value. precise = repeatableaccurate = trueDiscovery Video Clip
12 Precision and Accuracy Significant digits are necessary when calculatingDON’T COUNT Zeros at the end of the number without a decimal (ex. 1300) OR Zeros at the beginning of a decimal (ex ). Video ClipWhen adding or subtracting, use the smallest number of decimal places.Example:+ 3.17.687Decimal places = 3Decimal places = 1Answer in significant digits = 7.7
13 Precision and Accuracy Scientific notation is used so large numbers are easier to understand.Move the decimal point until only 1 nonzero number remains on the left. Count the number of places you moved the decimal and use that number as a power of tenExamples:= x 1010= 4.5 x 10-743289 = x 104
14 Length Distance from one point to another METER (M) is the basic unit 1M = 100cm1M = 1000mm1km = 1000M
15 Volume Amount of space an object takes up Liter (L) is the basic unit of LIQUID volumeCubic centimeter (cm3) is the basic unit of SOLID volume
16 MassAmount of matter in an objectGram (g) is the basic unit
17 Weight Amount of attraction between two objects due to gravity Newton (N) is the basic unitMASS AND WEIGHT ARE NOT THE SAME!
18 Density Mass per unit volume of a substance g/mL is the basic unit Formula: Density = Mass divided by VolumeDensity = g/mLDensity of water is 1gram/milliliterIf an object’s density is less then one it will float.If an object’s density is greater then one it will sink.
19 Temperature Measure of hotness and coldness Celsius (C°) is the basic unitWater freezes at 0° degree Celsius and boils at 100° degrees Celsius.